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New indexes of body fat distribution and sex-specific risk of total and cause-specific mortality: a prospective cohort study
BMC Public Health volume 18, Article number: 427 (2018)
A number of prior studies have examined the association between anthropometric measures and mortality, but studies investigating the sex-specific predictive value of novel anthropometric measures on mortality are scarce so far. Therefore, we investigated the sex-specific relevance of the new anthropometric measures body adiposity index (BAI) and waist to height ratio (WHtR) as well as the common measures body mass index (BMI), waist circumference (WC), and waist to hip ratio (WHR) for cause-specific mortality risk.
The analysis was based on data from the German population based KORA (Cooperative Health Research in the Region of Augsburg) Augsburg cohort study. A total of 6670 men and 6637 women aged 25 to 74 years at baseline examination were included. During a mean follow-up period of 15.4 years, 2409 persons died. Via Cox proportional hazard regression, the associations between the different anthropometric measures and all cause-, cardiovascular disease (CVD)- and cancer mortality were assessed.
BMI, WC, and WHR were significantly associated with all-cause and CVD-mortality in both sexes. WC and WHR were particularly associated with higher all-cause and CVD-mortality risk in women, while in men especially WHtR and BAI were strongly related to these outcomes. Females with WC, WHtR, and WHR measures in the 4th quartile compared with women in the 2nd quartile had a higher risk of death from cancer. Contrary, men in the lowest quartile of WC and WHtR in comparison to men in the 2nd quartile had a significantly elevated cancer mortality risk. BAI was no risk predictor for all-cause and cause-specific mortality in women.
Central obesity reflects higher all-cause and CVD-mortality risk particularly in women. BAI and WHtR seem to be valid as risk predictors for all-cause and especially CVD mortality in men but not women. There are marked sex-differences regarding cancer mortality risk for the different anthropometric measures.
It is well known that obesity is a risk factor for cardiovascular and metabolic diseases  and also for the development of certain cancer entities . Furthermore, the association between body fat and mortality has been frequently discussed in a number of previous studies [3,4,5,6,7,8,9]. Body mass index (BMI) is a measure of obesity that is widely used, but it is not suited to differentiate between lean mass and fat mass [10, 11]. It is an important limitation that BMI does not consider the distribution of body fat, because nowadays it is well known that a number of diseases and also mortality are more closely related to visceral fatty tissue accumulation than overall body fatness [12,13,14,15]. Other measures of obesity have been developed and studied which consider body fat distribution to provide a better input concerning visceral or central obesity like waist circumference (WC), waist-to-hip ratio (WHR) and waist-to-height ratio (WHtR). Finally, in 2011 a new measure called “body adiposity index” (BAI) was introduced to estimate body fat percentage. Prior studies have already tried to find out the anthropometric measure which is the best predictor of total and cause-specific mortality [5, 16]. Study results were partially inconsistent regarding the role of BMI . So far, European studies that investigated the association between values of novel anthropometric measures and cause-specific mortality in men and women are scarce. Thus, the aim of the present study was to determine which body fat measure was significantly predictive of all-cause-, CVD- and cancer mortality. To investigate whether there are sex-specific particularities regarding the associations, the analysis was conducted separately in men and women including a sample of the general German population.
Data from the Cooperative Health Research in the Region of Augsburg (KORA) study which is a prospective population-based cohort study in Southern Germany were used. In brief, four independent cross-sectional surveys were conducted in 1984/85 (Survey (S) 1), 1989/90 (S2), 1994/95 (S3) and 1999/2001 (S4); individuals aged 25 to 64 (S1) / 74 (S2-S3) years were included. For the present analysis, data from altogether 13,869 participants of S2, S3, and S4 were available. Data from 562 participants were excluded due to missing values in one or more of the variables required for the multivariable analyses. Thus, the final data set consisted of 6670 men and 6637 women. All subjects were prospectively followed until 2011, so the maximum observation time was 22 years. The study design, sampling method and data collection have been described in detail elsewhere . The study was approved by the ethics committee of the Bavarian Medical Association (“Bayerische Landesärztekammer”) and performed in accordance with the Declaration of Helsinki. All individuals whose data were included in the analyses gave their written informed consent to participate in the study.
The endpoints considered in our study were overall mortality and cause-specific mortality (any CVD and cancer). Mortality was recorded by regularly checking the vital status of all study participants through the registration offices inside and outside the study region. Once the health certificates have been received from the local health departments, they were coded by a single trained person using the 9th revision of the International Classification of Diseases (ICD-9). The coding of the causes of death was as follows: CVD (ICD-9 390–459, 798), cancer (ICD-9 140–208), and deaths from any cause (ICD-9 001–999). The data collection and procedures are described in more detail elsewhere .
We analysed and compared five different anthropometric measures: Waist circumference was measured at the level midway between the lower rib margin and the iliac crest in standing position. Hip circumference was recorded at the maximum circumference over the buttocks. As further measures we computed the waist to hip ratio and the waist to height ratio. BMI was calculated as weight divided by height squared in kg/m2. The formula used for body adiposity index was: BAI = [(hip circumference (cm)/height (m)1.5) − 18] × 100 . All anthropometric measures were assessed by trained medical staff.
Information on age, sex, sociodemographic characteristics and medical histories was assessed by standardized computer-aided interviews. Study participants provided information on physical activity during leisure time, on alcohol consumption and smoking status. The leisure time activity collected separately for summer and winter has been combined and categorized as active and inactive. A study participant was considered active if he/she reported a leisure time activity of at least 1 h per week in at least one season.
The amount of daily alcohol intake was divided into 3 categories: 0, 0.1 to 19.9, and 20.0 or more g/d for women; and 0, 0.1 to 39.9, and 40 or more g/d for men. Smokers were divided into current (occasional or regular), ex- and never smokers.
Education level was defined as high in case of final secondary school examination (Abitur or Fachabitur) and otherwise as low. The variable “survey” forms the basic examination in which the respective subjects participated (S2, S3, or S4). The data collection and procedures regarding standardized medical examinations are described in more detail elsewhere .
Baseline characteristics in the subgroups were given as means ± standard deviation (SD) or frequencies (%). For testing whether there were differences between surviving and deceased subjects the Wilcoxon signed-rank test as a nonparametric test was used. Correlations between anthropometric measures were evaluated with the Pearson correlation analysis. Cox proportional hazards models were used to estimate the Hazard ratios (HR) and 95% confidence intervals (95% CI) for the association between anthropometric measures and mortality. Proportional hazards assumptions as a precondition for Cox regression analysis were tested graphically and in case of uncertainty also with time-interaction terms. Subjects were divided into quartiles of the different anthropometric parameters, separately for men and women. Then HRs with 95% CIs for total mortality and also for CVD and cancer mortality were calculated. Limits of the generated quartiles are shown in Table 1. In the analysis using the anthropometric measures as categorized variables, the second quartile was always used as the reference category. In additional analyses, Cox proportional hazards models have been performed using the WHO cut-off values for BMI (18.5–24.99; 25–29.99; > = 30 kg/m2). In this analyses, persons with an extremely low BMI < 18.5 (n = 86) were excluded; as reference category the group with a BMI between 18.5 and 24.99 kg/m2 was used.
Interactions of the anthropometric measures with sex and age were tested. For the Cox regression model initially the following variables as potential confounders were considered: sex, age, survey, education level, alcohol intake, smoking status and physical activity. As they all showed significance in the full model, they were kept in. Traditional risk factors like blood pressure, blood lipid values and diabetes were considered as mediators and therefore not included in the model. For the sub-analyses regarding the outcomes cancer and CVD mortality we used the same adjustment variables as mentioned above. Because of the non-linearity of the associations, cubic smoothing splines were fitted to the estimated hazard ratios to show the relationship between different anthropometric measures and mortality. Confidence bands are given to visualize the uncertainty of the estimations. A p-value of < 0.05 was considered statistically significant. All statistical analyses were conducted with the software package SAS 9.2 and R 3.3.2.
Of the 13,307 included individuals, 2409 died until 2011. Of those, 1032 persons died due to CVD (ICD-9390–459, 798), and 791 due to cancer (ICD-9140–208). The mean observation time was 15.4 years (SD 5.0). Tables 2 and 3 present the baseline characteristics of men and women in the different mortality groups (total, CVD, and cancer mortality). Compared to women, men at baseline had a significantly higher education; they drank significantly more alcohol, were significantly more often smokers and had significantly higher blood pressure values (all p-values < 0.0001). The five anthropometric measures waist circumference (WC), body mass index (BMI), waist to hip ratio (WHR), waist to height ratio (WHtR) and body adiposity index (BAI) were all significantly higher in subjects who died during follow-up, except for men in the cancer group. Compared to the total- and the cancer mortality group, men and women with CVD deaths had the highest level of serum cholesterol concentrations, were less physically active and revealed the highest values in all anthropometric measures. Men and women who died from cancer had the highest alcohol intake and were more frequently current smokers. They also had the lowest values in all anthropometric measures (except BMI in women) compared to the other mortality groups.
The calculated correlation coefficients between the anthropometric measures showed high correlation coefficients, in particular between BMI and BAI, WC, and WHtR (Table 4).
Anthropometric measures and all-cause mortality
Due to significant interactions with sex in the fully adjusted model all analyses were stratified by sex. The P values for interactions between sex and BMI, BAI, WC, WHR, and WHtR were 0.0662, 0.2669, 0.0002, 0.0001, and 0.0054, respectively (for outcome total mortality).
In multivariable analysis men and women in the highest quartile of BMI compared to subjects in the second quartile had a significantly elevated risk to die from any cause. Men but not women in the bottom quartile of BMI had also a higher all-cause mortality risk compared to the second quartile. Men in the fourth quartile of BAI, WC, and WHR and men in the first, third and fourth quartile of WHtR showed a significantly higher all-cause mortality risk in comparison to the reference group. However, in women a somewhat different association became apparent: there was no significant relationship of BAI and all-cause mortality. Women in the fourth quartile of WHtR and women in the third and fourth quartile of WC compared to the second quartile showed a significantly increased total mortality risk. Regarding WHR, women in the third and fourth quartile had a strongly elevated risk to die from all-cause in comparison to the reference group, whereas the first quartile had a lower risk (Table 5).
Anthropometric measures and CVD mortality
Regarding CVD mortality, men and women in the highest quartile of BMI, WHtR, and WHR had a significantly higher risk to die in comparison to persons in the second quartile (Table 6). While men in the third and fourth quartile of BAI had a significantly elevated CVD mortality risk compared to the reference group there was no association between BAI and CVD mortality in women. Increased WC at baseline also predicted CVD mortality in both sexes. Compared to the second quartile only men in the fourth quartile had a significantly elevated CVD mortality risk, while for women this was found in the third and fourth quartile.
Anthropometric measures and cancer mortality
The risk to die from cancer increased in women in the fourth quartile of WC, WHR, and WHtR in comparison to women in the second quartile. Furthermore, females in the lowest quartile of WHR had a significantly lower cancer mortality risk compared to the reference group. In women there was no association found between BMI as well as BAI and cancer mortality. A different picture appeared regarding the association between anthropometric measures and cancer mortality in men. Males in the bottom quartile of BMI, WC, and WHtR had a significantly higher risk to die from cancer in comparison to the reference group. There was no association between BAI as well as WHR and cancer mortality in men (Table 7).
We also examined the association between BMI and cause-specific mortality using the WHO cut-off values (Additional file 1). It was found that men in the BMI group 25–29.99 kg/m2 had a significantly lower total and cancer mortality risk; only men with a BMI > = 30 kg/m2 had a significantly elevated CVD mortality risk. In women, however, there was a significantly increased total, CVD and cancer mortality risk in the category of a BMI > = 30 kg/m2.
In the age-group > 60 years all 5 anthropometric measures were associated with total mortality; persons in the fourth quartile of the respective measure had an elevated mortality risk. Only persons in the bottom quartile of WHR compared to the second quartile had a lower total mortality risk. Regarding CVD mortality, BMI showed no association with the outcome; the over 60 years old persons in the bottom quartile of BAI, WC, WHR, and WHtR had a significantly lower CVD mortality risk. Furthermore, persons in the highest quartile of WHtR compared to the reference group had an elevated CVD mortality risk. Regarding cancer mortality only participants in the fourth quartile of BMI and WHtR compared to the reference category had a significantly elevated risk.
In the age-group <= 60 years, persons in the bottom quartile of all five measures had a significantly lower total mortality risk in comparison to the reference group. Furthermore, participants in the third and fourth quartile of all five measures (BMI only fourth quartile) had a significantly elevated total mortality risk in comparison to the second quartile; this was also the case with regard to CVD mortality. Compared to the reference group only persons in the bottom quartile of WHR and BAI had a significantly lower CVD mortality risk. Regarding cancer mortality, persons in the bottom quartile of BMI, WC, WHR, and WHtR had a significantly lower risk, while participants in the fourth quartile of BAI, WC, WHR, and WHtR had a significantly higher risk than the reference group.
In this population-based cohort study, among the analysed anthropometric measures BMI, WC, and WHR were significantly associated with all-cause and CVD-mortality in men and women. Central obesity seems to reflect higher mortality risk particularly in women. In men, WHtR and BAI was found to be strongly and independently related to all-cause and CVD mortality, respectively. Regarding cancer mortality, a distinct mortality risk pattern turned out in men and women for the different anthropometric measures. The adiposity measure BAI may not play a role as risk predictor for all-cause and cause-specific mortality in women. All five measures were associated with the different mortality outcomes in persons <=60 as well as persons > 60 years, but the associations were more pronounced and stronger in the younger age-group.
Body adiposity index as a risk predictor of mortality
The BAI has recently been proposed as an alternative index of obesity . So far, prospective studies on the association between BAI as “novel” anthropometric measure and cause-specific mortality including men and women from the same population are scarce. In the present investigation, it was found that BAI was not a meaningful predictor for total or cause-specific mortality in women. To the best of our knowledge, no comparable population-based studies on this issue including women are available. Thus, this novel finding has to be confirmed or refuted in further prospective studies. A possible reason for our finding could be that BAI does not characterise central obesity, which is associated with higher mortality risk particularly in females. In addition, studies which investigated the validity of BAI to reflect body fat percentage found only a poor concordance [20, 21]. Contrary to women, in men, BAI turned out to be a good risk predictor particularly for CVD-mortality in the present study. Another investigation examining the association between BAI and all-cause as well as CVD-mortality including 19,756 adult men from Dallas, Texas, reported that BAI is not a better mortality predictor than BMI or WC . Contrary to the present population-based study, that study included participants who were referred by their employers or physicians. Thus, the findings of the studies would not directly be comparable. An Australian study on 4175 males free of heart disease, diabetes and stroke from the population found that BAI may be of interest as a measure of obesity but that it was not an independent predictor of CVD and coronary heart disease mortality .
The found association between BAI and CVD mortality in men was comparable to the associations between the other investigated general obesity measure BMI and CVD mortality. Because BAI requires a mathematical calculation of some complexity, in clinical practice it seems easier to use the common anthropometric measures such as BMI to estimate someone’s CVD risk.
Anthropometric measures and all-cause mortality
In the present study BMI showed a u-shaped association with all-cause mortality in men and women. This pattern is already well known, for example from a collaborative analysis of 57 prospective studies, where in both sexes mortality was lowest at a BMI about 22.5 to 25 kg/m2 . In our study a significantly higher mortality risk from any cause in the lowest and highest quartiles of BMI were only shown in men. Waist to hip ratio showed a linear risk increase through all categories in women. In men, however, the rise was less distinct. In a meta-analysis from Czernichow et al. including nine UK cohort studies, they also found a significant risk increase for rising waist to hip ratios . In that meta-analysis no testing for sex differences was reported. A Swedish study including female participants only showed that obesity does not seem to be a risk factor for increased mortality as long as it is not centrally located .
Anthropometric measures and CVD mortality
Central obesity as a risk factor for all-cause and CVD mortality has been described in a number of other studies [6, 7, 9]. In our study, central obesity was strongly associated with CVD mortality, particularly in women. A comparable study from the Netherlands that also looked for sex differences in all-cause and CVD mortality did not detect a sex difference in waist-associated measures . However, they only considered subjects aged 55 and older, raising the question if there could be differences regarding the impact of central obesity on mortality risk in different age-groups. Further studies underlined that anthropometric measures of abdominal obesity were strongly and positively associated with all-cause and CVD-mortality in women [26, 27]. A high WHtR turned out as a significant risk predictor for CVD mortality in both sexes. This is in accordance with another study including 16,332 men in the Physicians’ Health Study and 32,700 women in the Women’s Health Study which demonstrated that WHtR was strongly associated with an increased CVD risk (including nonfatal myocardial infarction, nonfatal ischemic stroke, cardiovascular death) in men and women. Due to the somewhat different outcomes in the studies, the results are surely not entirely comparable .
Anthropometric measures and cancer mortality
In the present study women with higher WC and WHtR had a significantly higher risk to die from cancer. Furthermore, females in the highest quartile of WHR in comparison to the reference group had a significantly elevated risk, whereas females in the first quartile had a lower risk. Contrary, in men lower values of BMI, WC, and WHtR were significantly related to higher cancer mortality. Previous studies predominantly looked for differences in the influence of BMI on cancer mortality. In addition they were mainly searching for differences between cancer sites and often did not focus on sex differences [2, 29]. From these studies it is known that mortality risk due to obesity differ strongly depending on the cancer sites. It is remarkable that overweight patients had a higher mortality risk mainly in hormone-associated cancers like postmenopausal breast cancer, endometrial and ovary cancers . This provides us a possible explanation for the higher risk in women with central obesity, because their cause of death from cancer is more often an obesity-associated tumour. A study from Zhang et al. also reported a strongly positive association between abdominal obesity and cancer mortality in women . Contrary, in men the higher cancer mortality in the bottom quartile in comparison to the reference group may be due for example to smoking-related tumours .
Other studies have also shown that a more android fat distribution in women, expressed as a higher WC, WHtR, and WHR, is associated with a higher risk of disease [26, 27, 31]. For females, measurements of the total fat mass of the body, such as BAI and BMI, might play a more subordinate role in terms of mortality risk. On the other hand, in men the general overweight and obesity measures BMI and BAI seems to be suitable as disease predictors in addition to the measures displaying fat distribution. BAI and BMI were highly correlated measures in our study sample and there was a clearer correlation between these measures and an increased overall and CVD mortality risk in men compared to women. As underlying mechanisms for the higher mortality risk associated with a visceral fat accumulation, particularly in women, a number of different causes are suggested [32, 33]. For example, visceral fat is metabolically active with secreting large quantities of proinflammatory cytokines, which could accelerate the atherosclerotic process and increase the risk of CVD . The underlying mechanisms for the protective effect of gynoid and peripheral fat are unknown so far . Furthermore, the mechanisms for the found differences between men and women are not entirely clear. More research is needed to elucidate what sex-specific mechanisms with regard to body fat distribution are involved in disease development.
Strengths and limitations
The main strengths of the present study are the large sample size with a balanced proportion of men and women from a population based study and the long follow-up time of an average of 15 years with a high number of outcomes. In addition, all anthropometric measures were collected in a standardized way by trained staff, which is why we can expect reliable phenotyping. As a limitation, residual confounding by unmeasured variables for example dietary factors and comorbidities cannot be entirely ruled out. When evaluating the relation between anthropometric measures and mortality, it might be important to consider lifestyle factors such as diet. A healthier diet often in combination with a healthier overall lifestyle is associated with a lower risk of mortality and less overweight and obesity . Thus, confounding by diet could have caused the independent effects found in our study to be overestimated. Furthermore, anthropometric measures were assessed at only one point in time, so the estimates could not account for changes in anthropometric measures during follow-up. This study included German subjects up to an age of 74 at baseline, thus, risks may differ in older people and persons of other ethnicity.
In this population based cohort study well established anthropometric measures such as increased BMI, WC, WHtR, and WHR were significantly associated with a higher all-cause and CVD-mortality in men and women. Regarding the relationship between common anthropometric measures and cancer mortality, distinct sex-differences became apparent. The novel measure BAI seems to play a role as risk predictor for all-cause and particular CVD mortality in men only and to be not a useful measure in both sexes regarding the prediction of cancer mortality.
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The KORA study was initiated and financed by the Helmholtz Zentrum München – German Research Center for Environmental Health, which is funded by the German Federal Ministry of Education and Research (BMBF) and by the State of Bavaria.
No funding was received for the research.
Availability of data and materials
The authors confirm that, for approved reasons, access restrictions apply to the data underlying the findings and thus they cannot be made freely available in the manuscript, the supplemental files, or a public repository. The data are subject to national data protection laws and restrictions were imposed by the ethics committee of the Bavarian Medical Association (“Bayerische Landesärztekammer”) to ensure data privacy of the study participants. However, they can be applied for through an individual project agreement with KORA. Other interested authors can access the data in the same way the authors used to access the data. Applications for access to the data sets can be found at the following link: https://www.helmholtz-muenchen.de/kora/fuer-wissenschaftler/zusammenarbeit-mit-kora/index.html.
Ethics approval and consent to participate
The study was approved by the ethics committee of the Bavarian Medical Association (“Bayerische Landesärztekammer”) and performed in accordance with the Declaration of Helsinki. All individuals whose data were included in the analyses gave their written informed consent to participate in the study.
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The authors declare that they have no competing interests.
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BMI and cause-specific mortality. Hazard ratios (HR) and confidence intervals (CI) for the association between BMI and cause-specific mortality by WHO definition in men and women. (DOCX 14 kb)
Different anthropometric measures and total mortality. Hazard ratios (HR) and confidence intervals (CI) for the association between the different anthropometric measures and total mortality for persons <=/> 60 years by quartiles; the second quartile was set as the reference category. (DOCX 21 kb)
Different anthropometric measures and CVD mortality. Hazard ratios (HR) and confidence intervals (CI) for the association between the different anthropometric measures and CVD mortality for persons <=/> 60 years by quartiles; the second quartile was set as the reference category. (DOCX 21 kb)
Different anthropometric measures and cancer mortality. Hazard ratios (HR) and confidence intervals (CI) for the association between the different anthropometric measures and cancer mortality for persons <=/> 60 years by quartiles; the second quartile was set as the reference category. (DOCX 21 kb)
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Cite this article
Rost, S., Freuer, D., Peters, A. et al. New indexes of body fat distribution and sex-specific risk of total and cause-specific mortality: a prospective cohort study. BMC Public Health 18, 427 (2018). https://0-doi-org.brum.beds.ac.uk/10.1186/s12889-018-5350-8
- Anthropometric measures
- All-cause mortality
- Cardiovascular mortality
- Cancer mortality
- Body adiposity index
- Prospective study